<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul,
        ol,
        li {
            list-style: none;
        }

        .tab {
            width: 600px;
            height: 400px;

        }
    </style>
</head>

<body>
    <div class="tab">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
        </ul>
    </div>
    <script>

    </script>
</body>

</html>